Silan
Semiconductors
SC9149A/SC9150A
To make code bit to “1” on SC9148A, connect diode to CODE terminal from T1~T3 terminal. To set Code bit “0” ,
open the circuit.
SC9149A has C2 and C3 code terminal. Code bit of C1 has been pulled up in IC and C1 is always kept at “1”
status.
Therefore, on transmitter SC9148A it is necessary to keep C1 code bit at “1” . Example 1 is the external circuit
diagram when Code bit C2=1 and C3=0.
2. COMBINATION OF SC9148A/SC9150A CODE BITS
SC9148A
T3
CODE (C3)
T2
(C2)
T1
(C1)
Code:
C1=C3=1,C2=0
13
12
11
10
K1~K10
VDD
16
VDD
15
OSC
22
Code1
(C1)
21
Code2
(C2)
SP1~SP10
Code:
C1=1,C2=0
SC9150A
Example 2 (C1=1 and C2=0)
The combination of code bits of SC9148A and SC9150A is shown in the following table.
C1
SC9148A
C2
C3
SC9150A
C2
C3
1
0
1
1
0
0
1
1
0
1
1
1
1
1
1
On SC9150A, C3 code has been pulled up in IC and always kept at “1” status. Therefore , it is necessary to keep
Code Bit C3 of transmitter SC9148A at “1”. To keep Code Bit C3 at “1”, connect a diode to CODE terminal from T3
terminal.
4. Note for Input Signal
If input voltage above V
DD
+0.3V may possibly be applied to Rx Input Terminal(2 Pin), connect resistor of about
10kΩ in series to Rx Input terminal in order to prevent latch-up. expect SC9149AHN. Other circuit should be
connect as following: output signal of infrared receiver should be inversed, and then input RXIN port.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD.
Rev: 1.2
2003.01.21
11
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